Fix broken links

[WillCWX]

Also fixes some of my undo/redo implementation details

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4b08bd4) 72.34% compared to head (55b3a4b) 72.34%.

❗ Current head 55b3a4b differs from pull request most recent head 14d50cb. Consider uploading reports for the commit 14d50cb to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #174   +/-   ##
=========================================
  Coverage     72.34%   72.34%           
  Complexity      606      606           
=========================================
  Files            95       95           
  Lines          1985     1985           
  Branches        229      229           
=========================================
  Hits           1436     1436           
  Misses          459      459           
  Partials         90       90           

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